JP2019180200A - Motor and air blower - Google Patents

Abstract

To provide a motor which is easy to assemble.SOLUTION: A motor comprises a rotor 15, a stator 14, and a circuit board 30 arranged below the stator. The motor comprises: an insulator 142 which covers at least parts of upper surfaces, lower surfaces and circumferential side faces of teeth of the stator; a coil 143 which is formed by winding the teeth with a conductor via the insulator; and a lead-out wire which is led out from the coil and electrically connected to the circuit board. An insulator lower part comprises a guide part 18 radially outside the coil. The guide part comprises a first wall part extending downward from a lower surface of the insulator, and a bent part extending radially outward from a lower end part of the first wall part. At least a part of the lead-out line is arranged in a circumferential direction along a radially outer surface of the first wall part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motor and a blower provided with the motor.

  A conventional brushless motor is disclosed in Patent Document 1. The rotor of the brushless motor described in Patent Document 1 includes a shaft, a frame, and a rotor magnet. The shaft is rotatably supported by an oil-impregnated metal press-fitted and fixed to the bracket. On the other hand, an armature in which a copper wire is wound around a stator core via a resin insulator is press-fitted and fixed to the outside of the bracket. Furthermore, a printed circuit board on which a circuit for driving and controlling the motor is mounted and fixed to a mounting base portion included in the bracket by a double-sided tape (not shown). The winding end of the armature copper wire is wired on the printed circuit board to form a stator.

JP 2002-262540 A

  However, in the brushless motor described in Patent Document 1, the winding end of the armature conductor is wired on the printed circuit board at the lower portion in the axial direction of the stator. At this time, the winding end of the conducting wire may be loosened, and wiring work is difficult.

  An object of the present invention is to provide a motor that can be easily assembled.

  An exemplary motor of the present invention includes a rotor, a stator, and a circuit board. The shaft extends along a central axis that extends vertically. The rotor is rotatable around the central axis. The stator faces the rotor in the radial direction. The circuit board is disposed below the stator. The stator includes an annular core back, a plurality of teeth extending in the radial direction from the core back and arranged in the circumferential direction, an insulator that covers at least a part of the upper surface, the lower surface, and the side surface in the circumferential direction of the teeth, and the insulator. A coil formed by winding a conductive wire around the teeth, and a lead wire drawn from the coil and electrically connected to the circuit board. The lower part of the insulator includes a guide portion radially outward from the coil. The guide portion includes a first wall portion that extends downward from the lower surface of the insulator, and a bent portion that extends radially outward from the lower end portion of the first wall portion. At least a part of the lead wire is arranged in the circumferential direction along the radial outer surface of the first wall portion.

  The motor according to the exemplary embodiment of the present invention is easy to assemble.

FIG. 1 is a perspective view of a blower according to the present invention. FIG. 2 is an exploded perspective view of the blower according to the present invention. FIG. 3 is a longitudinal sectional view of the blower device taken along a plane including the central axis. FIG. 4 is an enlarged cross-sectional view in which a portion of the housing where the chip holder and the suction magnet are arranged is enlarged. FIG. 5 is a vertical cross-sectional perspective view of the chip holder, the suction magnet, and the thrust plate. FIG. 6 is an exploded perspective view of the chip holder, the suction magnet, and the thrust plate. FIG. 7 is an enlarged cross-sectional view of another example of the magnetic attraction unit. FIG. 8 is a perspective view of still another example of the magnetic attraction unit. FIG. 9 is a perspective view of still another example of the magnetic attraction unit. FIG. 10 is a plan view of the base portion to which the circuit board is attached. FIG. 11 is an enlarged perspective view of the base portion with the circuit board removed. FIG. 12 is an enlarged cross-sectional perspective view of the vicinity of the substrate holding portion. FIG. 13 is a perspective view of the stator as viewed from below. FIG. 14 is a bottom view of the stator shown in FIG. FIG. 15 is a perspective view of the enlarged guide portion as viewed from above. FIG. 16 is a perspective view of the enlarged guide portion as viewed from below. FIG. 17 is an enlarged cross-sectional view in which the stator including the guide portion and the base portion are enlarged. FIG. 18 is an enlarged cross-sectional view in which a stator and a base portion including another example of the guide portion are enlarged.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In the present specification, in the blower A, the direction parallel to the central axis J of the blower A is “axial direction”, the direction orthogonal to the central axis J of the blower A is “radial direction”, and The direction along the arc centered on the central axis J is referred to as “circumferential direction”. Similarly, with respect to the impeller 20, the directions that coincide with the axial direction, the radial direction, and the circumferential direction of the blower A in the state of being incorporated in the blower A are simply “axial direction”, “radial direction”, and “circumferential direction”, respectively. Called “direction”. Moreover, in this specification, in the air blower A, let an axial direction be an up-down direction. The vertical direction is simply a name used for explanation, and does not limit the positional relationship and direction in the usage state of the blower A.

(First embodiment)
<1. Overall configuration of blower>
An air blower according to an exemplary embodiment of the present invention will be described below. FIG. 1 is a perspective view of a blower according to the present invention. FIG. 2 is an exploded perspective view of the blower according to the present invention. FIG. 3 is a longitudinal sectional view of the blower device taken along a plane including the central axis. The blower A includes a motor 10 and an impeller 20.

  The impeller 20 rotates around a central axis J that extends vertically. The motor 10 is disposed below the impeller 20 and rotates the impeller 20.

<2. Impeller configuration>
The impeller 20 is a so-called centrifugal fan impeller that generates an air flow radially outward by rotation. When the impeller 20 rotates, air is taken in from the radial center portion of the upper surface in the axial direction, and the taken-in air is sent out radially outward. The impeller 20 is, for example, a resin molded product. As a resin constituting the impeller 20, an engineering plastic can be exemplified. Engineering plastic is a resin having excellent mechanical properties such as strength and heat resistance. The impeller 20 may be made of a material such as metal.

  As shown in FIGS. 1, 2, and 3, the impeller 20 includes an impeller base 21, an impeller hub 22, a plurality of blades 23, and a support frame 24. The impeller base 21 has a disk shape. The impeller hub 22 extends upward from the radial center of the impeller base 21. The impeller base 21 has an annular shape, and the radially inner edge is connected to the radially outer edge of the impeller hub 22. That is, the impeller base 21 is connected to a radial outer edge of a hub inclined portion 222 described later of the impeller hub 22.

  A plurality (11 in this case, as shown in FIG. 1) of the blades 23 are arranged at equal intervals in the circumferential direction outside the impeller hub 22 on the upper surface of the impeller base 21 in the radial direction. The radially inner side of the blade 23 is located on the front side in the rotational direction of the impeller 20 (indicated by an arrow C in FIG. 1) compared to the radially outer side of the blade 23. Thereby, when the impeller 20 rotates in the rotation direction C, an airflow directed radially outward is generated. The support frame 24 has an annular shape and is connected to the radially outer edges of the upper ends of the plurality of blades 23. The support frame 24 is fixed to the plurality of blades 23. The support frame 24 is a reinforcing member that reinforces the blades 23 by connecting the blades 23.

  The impeller hub 22 includes a hub top plate portion 221, a hub inclined portion 222, a hub cylinder portion 223, and a boss portion 224. The hub top plate portion 221 has a disk shape that expands in the radial direction. A radially outer edge of the hub top plate portion 221 is connected to the hub inclined portion 222. The hub inclined portion 222 has an annular cross section cut along a plane orthogonal to the central axis J, and has an inclination that faces radially outward as it goes downward in the axial direction. That is, the impeller hub 22 has a shape obtained by cutting the upper part of the cone, that is, a so-called truncated cone shape.

  As shown in FIG. 3, a lower surface recess 220 that is recessed upward is formed on the lower surface of the impeller hub 22. The hub tube portion 223 and the boss portion 224 are disposed inside the lower surface recess 220. The boss portion 224 is a convex portion that is provided at the center portion in the radial direction of the lower surface of the hub top plate portion 221 and protrudes downward.

  A hole 225 is provided at the center of the lower surface of the boss 224 (on the central axis J). The hole 225 has a cylindrical shape extending along the central axis J, and the center overlaps the central axis J. An upper end portion of the shaft 12 described later of the motor 10 is fixed to the hole portion 225. That is, the impeller 20 is fixed to the shaft 12. The impeller 20 and the shaft 12 are fixed by fixing the shaft 12 in the hole 225. The impeller 20 rotates around the central axis J with the shaft 12 as a rotation axis. In addition, although fixation with the shaft 12 and the impeller 20 is performed by insert molding in this embodiment, it is not limited to this. For example, you may fix by methods, such as press injection, adhesion | attachment, and welding. Further, the upper end of the shaft 12 may be screwed with a screw penetrating in the axial direction from the upper surface of the impeller hub 22. As a method of fixing the impeller 20 and the shaft 12, a method of firmly fixing the impeller 20 and the shaft 12 can be widely adopted.

  The hub cylinder portion 223 has a cylindrical shape that extends downward in the axial direction from the lower surface of the hub top plate portion 221. The center of the hub tube portion 223 overlaps the center axis J. A magnet holder 152 to be described later is fixed to the inner surface of the hub cylinder portion 223. The magnet holder 152 holds the rotor magnet 151. Note that the center of the rotor magnet 151 is overlapped with the central axis J by fixing the magnet holder 152 to the hub cylinder 223. In the present embodiment, the magnet holder 152 and the hub cylinder 223 are fixed by insert molding. The fixing of the magnet holder 152 and the hub cylinder 223 is not limited to insert molding, and a fixing method that can firmly fix the magnet holder 152 and the hub cylinder 223 can be widely used.

<3. Configuration of Motor 10>
As shown in FIGS. 2 and 3, the motor 10 is disposed below the impeller 20 in the axial direction. The motor 10 includes a base portion 11, a shaft 12, a bearing 13, a stator 14, and a rotor 15. The motor 10 is a so-called outer rotor type brushless motor, and a rotor 15 that is radially opposed to a radially outer surface of the stator 14 rotates around a central axis. That is, the motor 10 includes a rotor 15 that can rotate around the central axis J. The stator 14 faces the rotor 15 in the radial direction. The motor 10 includes a circuit board 30.

<3.1 Configuration of Base Unit 11>
As shown in FIGS. 2 and 3, the base portion 11 is a plate-like member disposed below the rotor 15. The base part 11 includes a plate part 111, a housing 112, and three arm parts 113. The plate portion 111 is located at the center in the radial direction when the base portion 11 is viewed in the axial direction. The housing 112 has a cylindrical shape extending along the central axis J upward from the radial center portion of the upper surface of the plate portion 111. A stator 14 is fixed to the outer surface of the housing 112 in the radial direction.

  The three arm portions 113 extend radially outward from the radially outer edge of the plate portion 111. The three arm portions 113 are arranged at equal intervals in the circumferential direction. A vibration isolating member 114 that suppresses transmission of vibration to the blower A is attached to the distal end of the arm portion 113 in the radial direction. The blower A is attached to the attachment target device with the vibration isolating member 114 in contact therewith. Note that the vibration isolation member 114 may be attached as necessary. The base portion 11 is a molded body of resin, and the plate portion 111, the housing 112, and the arm portion 113 are molded from the same member. One arm portion 113 of the plurality of arm portions 113 has a lead wire lead-out portion 1131 that holds a lead wire described later.

  The base portion 11 includes a holding recess 115 that is recessed along the central axis J from the upper surface of the housing 112. The bearing 13 and the shaft 12 are attached to the holding recess 115. The holding recess 115 includes a bearing holding portion 1151 that holds the bearing 13 and a small-diameter portion 1152 that is connected to the lower end portion of the bearing holding portion 1151 and has an inner diameter smaller than that of the bearing holding portion 1151. The lower end portion of the bearing 13 and the bottom surface of the bearing holding portion 1151 hold a retaining ring 19 (described later) sandwiched in the axial direction.

<Configuration of shaft 12 and bearing 13>
The shaft 12 has a cylindrical shape extending along the central axis J formed of a magnetic material. That is, the shaft 12 is made of a magnetic material and extends along the central axis J. The shaft 12 is made of iron, for example. The shaft 12 includes a retaining groove 121 and a lower surface convex portion 122. The retaining groove 121 is a groove that is recessed in the radial direction and extends in the circumferential direction. A retaining ring 19 described later fits into the retaining groove 121. The retaining ring 19 is fixed by being sandwiched between the lower surface of the bearing 13 and the bottom surface of the bearing holding portion 1151. The lower surface convex portion 122 is formed on the lower surface of the shaft 12. The lower surface convex part 122 is a curved surface having an inclination approaching the center as it goes downward in the axial direction. Note that the center in the radial direction of the lower surface convex portion 122 is in contact with a thrust plate 163 described later.

  The shaft 12 rotates in a state where the lower surface convex portion 122 is in contact with the thrust plate 163. In order to reduce resistance during rotation, it is preferable that the contact surface between the lower surface convex portion 122 and the thrust plate 163 has a smaller area. On the other hand, for example, when contact is made at one point, at least one of the lower surface convex portion 122 or the thrust plate 163 may be deformed. Therefore, it is preferable that the lower surface convex portion 122 has a shape that can suppress stress concentration at the contact portion while reducing the contact area with the thrust plate 163. Examples of such a shape include smooth curved surfaces such as spherical surfaces and paraboloids, in other words, differentiable curved surfaces. In addition to these, it is possible to widely adopt a shape that can suppress stress concentration at the contact portion while reducing the contact resistance.

  The bearing 13 has a cylindrical shape and is press-fitted into the holding recess 115. Thereby, the bearing 13 is fixed to the holding recess 115, that is, the bearing 13 is fixed to the housing 112. The bearing 13 supports the shaft 12. The bearing 13 is a fluid bearing, and a film of lubricating oil (not shown) is interposed between the inner surface of the bearing 13 and the outer surface of the shaft 12. The oil film reduces the frictional resistance between the inner surface of the bearing 13 and the outer surface of the shaft 12. That is, the shaft 12 is rotatably supported by the bearing 13. In other words, the shaft 12 is rotatably supported by the base portion 11 to which the bearing 13 is fixed. Note that at least the inner surface of the bearing 13 has a structure in which oil is circulated (supplied) through a gap with the outer surface of the shaft 12. An example of such a structure is a porous body.

  The shaft 12 is rotatably supported by the bearing 13. The impeller 20 is fixed to the upper part of the shaft 12 than the bearing 13, that is, to the upper part of the housing 112. A part of the lower end side of the shaft 12 (referred to as a lower end portion) protrudes below the bearing 13. A portion of the shaft 12 that protrudes below the bearing 13 is disposed inside the small diameter portion 1152. In addition, the lower part is lower than the retaining groove 121 of the shaft 12.

  The motor 10 includes a retaining ring 19 that prevents the shaft 12 from coming off. The retaining ring 19 is fixed by being sandwiched between the lower end surface of the bearing 13 and the bottom surface of the bearing holding portion 1151. The retaining ring 19 has an annular shape, and the shaft 12 passes therethrough. In other words, the retaining ring 19 faces the retaining groove 121 of the shaft 12 in the axial direction. The inner diameter of the through hole of the retaining ring 19 is larger than the outer diameter of the retaining groove 121. Furthermore, the inner diameter of the through hole of the retaining ring 19 is smaller than the outer diameter of the portion adjacent to the retaining groove 121 of the shaft 12 in the vertical direction. Therefore, when the shaft 12 moves upward, the side wall of the retaining groove 121 contacts the retaining ring 19 in the axial direction. Thus, the shaft 12 is prevented from coming off in the axial direction.

<3.3 Configuration of Magnetic Suction Unit 16>
As described above, since the outer surface of the shaft 12 and the inner surface of the bearing 13 are lubricated with oil, the shaft 12 is easy to move not only in the circumferential direction but also in the axial direction with respect to the bearing 13. Therefore, the motor 10 includes a magnetic attraction unit 16 that suppresses the upward movement of the shaft 12. Details of the magnetic attraction unit 16 will be described below with reference to the drawings. FIG. 4 is an enlarged cross-sectional view in which a portion of the housing where the chip holder and the suction magnet are arranged is enlarged. FIG. 5 is a vertical cross-sectional perspective view of the chip holder, the suction magnet, and the thrust plate. FIG. 6 is an exploded perspective view of the chip holder, the suction magnet, and the thrust plate.

  As shown in FIGS. 4 to 6, the magnetic attraction unit 16 includes a chip holder 161, an attraction magnet 162, and a thrust plate 163. The chip holder 161 includes a bottom portion 165, a tube portion 166, and a flange portion 167. The bottom 165 has a disk shape orthogonal to the central axis J. Here, the bottom portion 165 has a disc shape, but is not limited to a disc shape, and may have a polygonal shape when viewed from the axial direction. The bottom 165 can be shaped to match the shape of the attracting magnet 162 housed inside. The cylindrical portion 166 has a cylindrical shape extending upward from the radial outer edge of the bottom portion 165 along the central axis J. The flange portion 167 has an annular shape that extends radially outward from the upper end portion of the cylindrical portion 166. The flange portion 167 is not limited to an annular shape.

  The bottom portion 165, the cylindrical portion 166, and the flange portion 167 of the chip holder 161 are a single member. The chip holder 161 is manufactured by, for example, pressing or drawing a metal plate. An example of the metal plate constituting the chip holder 161 is an iron plate. Since the chip holder 161 is formed by pressing the metal plate, the chip holder 161 can be easily manufactured.

  When the chip holder 161 is manufactured by pressing the metal plate, the metal plate is placed in a die (die), and the portion that becomes the bottom 165 is pushed into the die with a tool (punch). At this time, stress concentrates on the connecting portion of the bottom portion 165 with the cylindrical portion 166. In order to suppress the influence of the stress on the entire bottom portion 165, a tool having an annular surface for pressing the metal plate is used. Accordingly, the bottom upper surface 1650 that is the upper surface of the bottom 165 includes a first surface 1651 and a second surface 1652.

  The first surface 1651 is deformed by the stress and residual stress during press working. On the other hand, since the stress is used for deformation of the first surface 1651, it is difficult to be transmitted to the second surface 1652, and the second surface 1652 is not substantially deformed. Therefore, the second surface 1652 is a plane orthogonal to the central axis J.

  As shown in FIG. 4, the first surface 1651 is disposed on the radially outer edge of the bottom portion 165. The first surface 1651 is connected to the lower end portion of the cylindrical portion 166. The first surface 1651 has an annular shape. Further, the second surface 1652 is disposed radially inward from the first surface 1651. Since the first surface 1651 is deformed by applying a force during press working, the first surface 1651 is thinner than the original metal plate. On the other hand, the second surface 1652 is not deformed and does not deform, and therefore has the same or substantially the same thickness as the original metal plate. Therefore, the second surface 1652 is located above the first surface 1651. In addition, since the 1st surface 1651 becomes thinner than the 2nd surface 1652, you may process separately with respect to the metal plate before press work. In the present embodiment, the lower surface of the attracting magnet 162 is in contact with the second surface 1652 of the bottom upper surface 1650. Therefore, in the chip holder 161, the second surface 1652 is required to have a higher processing accuracy than the first surface 1651. For example, since the flatness of the second surface 1652 of the bottom upper surface 1650 may be set smaller than the flatness of the first surface 1651 during the pressing of the chip holder 161, the chip holder 161 can be easily manufactured.

  The attraction magnet 162 has a cylindrical shape, and the upper surface 1621 and the lower surface 1622 are orthogonal to the center line of the column. In other words, the upper surface 1621 and the lower surface 1622 are orthogonal to the center line and parallel to each other. The attracting magnet 162 is a magnetic pole in which the upper surface 1621 and the lower surface 1622 are different in the axial direction. The attracting magnet 162 is housed inside the cylindrical portion 166. Here, the chip holder 161 is made of iron, and is made of a magnetic material. Therefore, the lower surface 1622 of the attracting magnet 162 is fixed to the second surface 1652 by a magnetic force. Further, a part of the outer circumferential surface of the attracting magnet 162 comes into contact with the inner surface of the cylindrical portion 166 by magnetic force and is fixed.

  The axial length of the attracting magnet 162 is shorter than the axial length of the cylindrical portion 166. Therefore, the upper surface 1621 of the attracting magnet 162 is positioned below the upper end of the cylindrical portion 166. That is, the attracting magnet 162 is housed inside the cylindrical portion 166. Thereby, the cylinder part 166 works as a back yoke of the attraction magnet 162 and reinforces the magnetic force of the attraction magnet 162.

  The lower surface 1622 of the attraction magnet 162 contacts at least a portion 1652 of the bottom upper surface 1650. As a result, the center line of the attraction magnet 162 is parallel to the center axis J. The phrase “the center line is parallel to the center axis J” includes the case where the center line overlaps the center axis J. Further, the upper surface 1621 of the attraction magnet 162 is orthogonal to the central axis J. In the present embodiment, the lower surface 1622 of the attracting magnet 162 is in contact with the second surface 1652 of the bottom upper surface 1650.

  The thrust plate 163 is disposed on the upper surface 1621 of the attraction magnet 162. In the present embodiment, the thickness of the thrust plate 163 is smaller than the thickness of the cylindrical portion 166. The thrust plate 163 may have a thickness that allows the magnetic flux from the upper surface 1621 of the attraction magnet 162 to pass therethrough and pull the lower end portion of the shaft 12. The upper surface 1621 of the attracting magnet 162 is opposed to the lower surface convex portion 122 of the shaft 12 in the axial direction with the thrust plate 163 interposed therebetween.

  Thereby, the lower surface of the shaft 12 is attracted by the magnetic force of the attracting magnet 162, and the lower surface of the shaft 12 comes into contact with the thrust plate 163. That is, the shaft 12 is sucked downward in the axial direction. At this time, the lower surface convex portion 122 of the shaft 12 is positioned below the upper surface of the flange portion 167. That is, the outer peripheral surface of the shaft 12 faces the inner peripheral surface of the cylindrical portion 166 in the radial direction. Thereby, the magnetic flux from the attraction magnet 162 is transmitted to the lower end surface of the shaft 12 through the cylindrical portion 166. Therefore, the attractive force for attracting the shaft 12 downward by the attractive magnet 162 can be increased. Therefore, when the motor 10 rotates, the shaft 12 can be prevented from rising upward due to buoyancy, and the operating efficiency of the motor 10 can be increased.

  Then, the shaft 12 is attracted by the attracting magnet 162 and rotates with its lower surface in contact with the thrust plate 163. The thrust plate 163 may be formed of a magnetic material. In this case, the force for attracting the shaft 12 by the magnetic force of the attracting magnet 162 can be increased.

  In the chip holder 161, the flange portion 167 is fixed inside the housing 112. The base part 11 is a molded body of resin, and the housing 112 is also molded of resin. The flange portion 167 is covered with a resin for molding the housing 112.

  In addition, as a method of arrange | positioning the flange part 167 inside resin, insert mold molding can be mentioned, for example. A chip holder 161 is attached to a mold for forming the base portion 11. Then, a resin is filled in a space in which at least the flange portion 167 of the chip holder 161 is disposed. The filled resin is cured and the base portion 11 is molded. Thereby, the chip holder 161 is fixed to the housing 112. In this way, the chip holder 161 can be fixed to the housing 112 and fixed to the base portion 11 by a single resin mold. The chip holder 161 can be easily fixed to the housing 112, and the motor 10 can be easily manufactured.

  In the present embodiment, the chip holder 161 is configured to cover the entire flange portion 167 with resin. However, if the chip holder 161 can be firmly fixed, a portion of the flange portion 167 may be covered with resin. On the other hand, what is covered with the resin is not limited to the flange portion 167, and the outer surfaces of the bottom portion 165 and the cylindrical portion 166 may be covered with the resin. In the chip holder 161, the flange portion 167 has an annular shape, that is, a circular outer shape when viewed in the axial direction, but is not limited thereto. For example, it may be an elliptical shape, a square shape, a polygonal shape such as a rhombus.

  The motor 10 can be easily assembled by providing the magnetic attraction unit 16 as described above. Further, the cylindrical portion 166 functions as a back yoke of the attraction magnet 162. Thereby, the attraction | suction force which attracts | sucks the shaft 12 by the attracting magnet 162 below can be heightened. Therefore, when the motor 10 rotates, the shaft 12 can be prevented from rising upward due to buoyancy, and the operating efficiency of the motor 10 can be increased.

<3.3.1 Modification 1 of Magnetic Attraction Unit>
FIG. 7 is an enlarged cross-sectional view of another example of the magnetic attraction unit. The tip holder 161a shown in FIG. 7 is different from the flange portion 167 of the tip holder 161 in the shape of the flange portion 167a. The other points of the chip holder 161a are the same as those of the chip holder 161. Therefore, in the chip holder 161a, the same parts as those of the chip holder 161 are denoted by the same reference numerals, and detailed description of the same parts is omitted.

  With respect to the direction orthogonal to the central axis J, the attitude of the thrust plate 163 and the attitude of the shaft 12 follow the attitude of the attracting magnet 162. As shown in FIG. 7, in the chip holder 161a, the flange portion 167a does not contact the shaft 12 body. Further, the thrust plate 163 and the attracting magnet 162 that are in direct contact with the shaft 12 are not in contact. Therefore, unlike the second surface 1652 of the bottom portion 165 with which the lower surface 1622 of the attracting magnet 162 contacts, even when the flange portion 167a is inclined with respect to the direction orthogonal to the central axis J, the posture when the shaft 12 is rotated is No effect. Therefore, the flange portion 167a may not be parallel to the direction orthogonal to the central axis J. As shown in FIG. 7, in the present modification, the flange portion 167 a is inclined with respect to the second surface 1652 of the bottom portion 165.

  The chip holder 161a is manufactured by pressing a metal plate in the same manner as the chip holder 161 described above. As described above, in the tip holder 161a, the accuracy of the angle with respect to the direction orthogonal to the central axis J required for the flange portion 167a is lower than the accuracy of the angle required for the second surface 1652. Therefore, the manufacture of the chip holder 161a is easy.

  Moreover, as shown in FIG. 7, in the chip holder 161a, the flange part 167a can be made into the shape which goes upwards as it goes to radial direction outward. That is, the flange part 167a has an inclination which goes upward as it goes to a radial direction outer side. By setting it as this shape, the bending angle of the flange part 167a at the time of a press work can be made small compared with the case where the flange part 167a is formed in parallel with the 2nd surface 1652 of the bottom part 165. Thereby, the stress which concentrates on the connection part of the flange part 167a and the cylinder part 166 can be reduced. For example, when the flange portion 167a is fixed to the housing 112 by insert molding, the residual stress accumulated in the flange portion 167a of the chip holder 161a may be released depending on the temperature and other conditions. Even in this case, since the residual stress accumulated in the flange portion 167a is small, the stress acting on the housing 112 can be reduced.

<3.3.2 Modification 2 of magnetic attraction unit>
FIG. 8 is a perspective view of still another example of the magnetic attraction unit. The chip holder 161b shown in FIG. 8 is different from the flange part 167 of the chip holder 161 in the shape of the flange part 167b. The other points of the chip holder 161b are the same as those of the chip holder 161. Therefore, in the chip holder 161b, the same parts as those of the chip holder 161 are denoted by the same reference numerals, and detailed description of the same parts is omitted.

  In the tip holder 161b shown in FIG. 8, the flange portion 167b includes flange convex portions 1671 in which the positions in the axial direction of the portions adjacent to a part in the circumferential direction are different. The upper surface of the flange convex portion 1671 protrudes in the axial direction as compared with other portions of the upper surface of the flange portion 167b. Further, the lower surface of the flange convex portion 1671 is recessed in the axial direction as compared with other portions of the lower surface of the flange portion 167b. The flange portion 167 b has a flange convex portion 1671, and thus undulates in the circumferential direction.

  When the flange portion 167b is disposed inside the resin of the housing 112, the flange convex portion 1671 becomes a resistance, and the movement in the circumferential direction of the chip holder 161b is restricted. In addition, in FIG. 7, although the part swelled upward is mentioned as the flange convex part 1671, it is not limited to this. For example, you may provide the part swelled below. Further, the flange portion 167b may have a shape in which a portion that swells upward and a portion that swells downward appear alternately. Moreover, the flange portion 167b may have an irregular uneven surface, without being limited to the shape in which the portion bulging upward and the portion bulging downward in the axial direction alternately appear periodically. Further, the upper and lower surfaces of the flange portion 167b may be provided with a combination of a thick portion and a thin portion of the flange portion 167b. That is, at least a part of one of the upper surface and the lower surface of the flange portion 167b has a wave in the circumferential direction.

<3.3.3 Modification 3 of Magnetic Attraction Unit>
FIG. 9 is a perspective view of still another example of the magnetic attraction unit. The inner surface of the cylindrical portion 166 c of the chip holder 161 c shown in FIG. 9 is opposed to the radially outer surface of the lower end portion of the shaft 12. The other points of the chip holder 161c have the same configuration as the chip holder 161. Therefore, in the chip holder 161c, the same parts as those of the chip holder 161 are denoted by the same reference numerals, and detailed description of the same parts is omitted.

  As shown in FIG. 9, the inner surface of the cylindrical portion 166 c of the tip holder 161 c is opposed to the outer surface of the shaft 12 in the radial direction on the entire circumference, that is, the outer peripheral surface of the shaft 12 extends around the entire circumference of the cylindrical portion 166 c. It faces the inner peripheral surface with a gap in the radial direction. By comprising in this way, the contact with the shaft 12 and the cylinder part 166c at the time of rotation can be suppressed. Further, by making the axial length of the cylindrical portion 166 c longer than that of the cylindrical portion 166, the contact area between the chip holder 161 c and the resin constituting the base portion is increased, and the chip holder 161 c is firmly attached to the base portion 11. Can be fixed.

<3.4 Configuration of Circuit Board 30 and Board Holding Unit 17>
The base unit 11 includes a plurality of substrate holding units 17. The circuit board 30 is held by the board holding unit 17. That is, the circuit board 30 is disposed below the stator 14. Here, details of the circuit board 30 and the board holding portion 17 will be described with reference to the drawings. FIG. 10 is a plan view of the base portion to which the circuit board is attached. FIG. 11 is an enlarged perspective view of the base portion with the circuit board removed. FIG. 12 is an enlarged cross-sectional perspective view of the vicinity of the substrate holding portion.

  As shown in FIG. 10, the circuit board 30 is held by the board holding part 17 provided on the plate part 111 of the base part 11. The circuit board 30 is disposed on the board mounting portion 116 that is a region radially outside the housing 112 in the plate portion 111. Note that a portion of the housing 112 that is close to the substrate mounting portion 116 includes a cut-out surface 1121 that is cut into a flat shape. The notch surface 1121 is a surface orthogonal to the radial direction.

  Here, the circuit board 30 will be described. The circuit board 30 includes an inner flat surface 301 and an outer flat surface 302. The inner flat surface 301 and the outer flat surface 302 are flat surfaces, and the inner flat surface 301 and the outer flat surface 302 extend in a direction orthogonal to the radial direction. When the circuit board 30 is attached to the board attachment portion 116, the inner flat surface 301 is a side surface on the central axis J side and faces the cutout surface 1121 of the housing 112 in the radial direction. When the circuit board 30 is disposed on the board mounting portion 116, the inner flat surface 301 is along the cutout surface 1121. Thereby, the circuit board 30 can be easily attached to the board holding part 17. Further, the circuit board 30 can be arranged close to the central axis J. The outer flat surface 302 is a side surface opposite to the central axis J of the circuit board 30. In the present embodiment, the inner flat surface 301 and the outer flat surface 302 are parallel. In plan view, the length of the inner flat surface 301 in the direction orthogonal to the central axis is longer than that of the outer flat surface 302. The inner flat surface 301 and the outer flat surface 302 are connected by a curved surface.

  The circuit board 30 includes a board through hole 303 that penetrates in the axial direction. The circuit board 30 is provided with two board through holes 303. The base part 11 includes a plurality of bosses 117 extending upward from the upper surface. The base portion 11 is provided with two bosses 117. A boss 117 penetrates the substrate through hole 303. Thereby, the movement of the circuit board 30 in the circumferential direction and the radial direction is limited. In order to limit the movement of the circuit board 30 in the circumferential direction and the radial direction, it is preferable that at least two board through holes 303 and bosses 117 are provided.

  Further, as shown in FIG. 10, a connection part 31, an external connection part 32, and a detection part 33 are provided on the upper surface of the circuit board 30. That is, the circuit board 30 includes a connection portion. The circuit board 30 includes a wiring pattern made of a conductive material such as aluminum or copper. The connection part 31 and the external connection part 32 are part of the pattern wiring. That is, the connection part 31 and the external connection part 32 are connection terminals. A lead wire 146 (see FIG. 17 and the like to be described later) drawn from a coil 143 to be described later is connected to the connecting portion 31. That is, the lead wire 146 is connected to the connection portion 31. By connecting the connection portion 31 and the lead wire 146, current from the drive circuit can be passed through the coil 143.

  For example, a lead wire Wr used for connection to an external device such as an external power source is connected to the external connection unit 32. The lead wire Wr connected to the external connection portion 32 is hooked on the lead wire lead portion 1131 and then drawn to the outside. The detection unit 33 includes a sensor mounted on the upper surface of the circuit board 30 and detects the rotation of the rotor 15. Examples of the sensor that detects the rotation of the rotor 15 include a Hall element. The detection unit 33 is preferably disposed in the vicinity of the rotor 15. Therefore, in the circuit board 30, the detection part 33 is arrange | positioned at radial inside, ie, the inner side flat surface 301 side.

  The circuit board 30 is held by the board holding part 17 after being arranged on the board attaching part 116 of the plate part 111. As a result, the circuit board 30 is fixed to the board mounting portion 116. Next, details of the substrate holding unit 17 will be described.

  As shown in FIGS. 10 to 12, the substrate holding part 17 includes a first extension part 171, a second extension part 172, a connecting part 173, and a claw part 174. The substrate holding part 17 is provided in the base part 11 and is formed of the same member as the base part 11.

  The first extension portion 171 extends downward from the lower surface of the base portion 11. The base portion 11 has a base through hole 118 that penetrates the base portion in the vertical direction. The base through-hole 118 has a rectangular shape when viewed from the axial direction. The first extension portion 171 has a cylindrical shape with a rectangular cross section that extends downward from all the edge portions of the four rectangular sides forming the base through-hole 118. Thus, the intensity | strength of the 1st extension part 171 can be raised by forming in a cylinder shape. In addition, when sufficient intensity | strength can be obtained, the 1st extension part 171 may not be a cylinder shape, for example, may be the wall shape extended from the edge part of one side of the base through-hole 118 to an axial direction downward.

  The second extension portion 172 extends from the lower side to the upper side of the base portion 11 in the base through-hole 118, and faces the first extension portion 171 with a gap. The second extension 172 passes through the base through-hole 118 from below to above.

  The connection part 173 connects the lower part of the first extension part 171 and the lower part of the second extension part 172. The first extension portion 171 is once extended downward and then connected to the second extension portion 172 via the connecting portion 173 at the tip thereof, whereby the axial length of the second extension portion 172 can be increased. Thereby, it can suppress that the deformation angle of the 2nd extension part 172 when attaching the circuit board 30 becomes large, and the stress concentration to the 2nd extension part 172 can be reduced. For example, even when a thick circuit board 30 is used, the distance from the upper surface of the base portion 11 to the upper end of the claw portion 174 does not need to be increased because the circuit substrate 30 extends downward from the base portion 11 once. Thereby, the board | substrate holding | maintenance part 17 can hold | maintain the circuit board 30 stably, suppressing that the motor 10 enlarges.

  In the longitudinal direction of the base through-hole 118, the length of the second extension portion 172 is shorter than the length of the connection portion 173. That is, the width of the second extension part 172 is smaller than the width of the connection part 173. By doing in this way, the 2nd extension part 172 is easy to change compared with connecting part 173. In addition, although the connection part 173 is connected with three sides of the 1st extension part 171, it is not limited to this, What is necessary is just to connect with at least one part. In the substrate holding part 17, the connecting part 173 protrudes from the wall part forming the long side of the first extension part 171 and is also connected to the wall part adjacent to the wall part. That is, the connecting portion 173 connects one long side of the first extension portion 171 and the short sides at both ends thereof. Thereby, the intensity | strength of the 1st extension part 171 and the connection part 173 can be raised.

  The claw portion 174 extends from the upper end of the second extension portion 172 in a direction intersecting the central axis J. In addition, in this embodiment, although the nail | claw part 174 extends toward the opposite side to the connection part 173 from the upper end of the 2nd extension part 172, it is not limited to this. For example, the claw portion 174 may extend from the upper end of the second extension portion 172 toward the connecting portion 173 side. The claw portion 174 includes a claw portion lower surface 1741 and a claw portion upper surface 1742. The claw portion lower surface 1741 is a lower surface of the claw portion 174 and is in contact with the upper surface of the circuit board 30. That is, at least a part of the lower surface of the claw portion 174 is in contact with the upper surface of the circuit board 30. The claw lower surface 1741 intersects the central axis J. The claw portion lower surface 1741 is disposed above the upper surface of the substrate mounting portion 116 by the thickness of the circuit board 30. In addition, in the nail | claw part 174, although the nail | claw part lower surface 1741 is a surface orthogonal to the central axis J, it is not limited to this. Further, the claw portion lower surface 1741 may be positioned above the upper surface of the substrate mounting portion 116 by the thickness of the circuit board 30. By doing so, there is a space between the circuit board 30 and the claw portion lower surface 1741, and the circuit board 30 can be easily attached.

  The claw portion upper surface 1742 is the upper surface of the claw portion 174 and is located above the claw portion lower surface 1741. And claw part upper surface 1742 is an inclined surface which goes below toward the direction which leaves | separates from 1st extension part 171. As shown in FIG.

  As shown in FIG. 10, the base portion 11 includes three substrate holding portions 17. Of the three substrate holders 17, two substrate holders 17 hold the inner flat surface 301 side of the circuit board 30, and one substrate holder 17 holds the outer flat surface 302 side of the circuit board 30. Hold. In the following description, the substrate holding unit 17 that holds the inner flat surface 301 side is referred to as the inner substrate holding unit 17m, and the substrate holding unit 17 that holds the outer flat surface 302 side is referred to as the outer substrate holding unit 17n as necessary. As a distinction.

  Then, the side surface on which the claw portion 174 of the inner substrate holding portion 17m extends is opposed to the inner flat surface 301 in a direction intersecting the central axis J. Further, the side surface on which the claw portion 174 of the second extension portion 172 of the outer substrate holding portion 17n extends is opposed to the inner flat surface 301 and the direction intersecting the central axis J.

  In this manner, the inner flat surface 301 side of the circuit board 30 is held by the two inner board holding portions 17m, and the outer flat surface 302 side of the circuit board 30 is held by the outer substrate holding portion 17n, thereby the circuit board 30. The movement in the direction away from the central axis J is limited.

  Next, attachment of the circuit board 30 to the board attachment portion 116 will be described. The boss 117 is passed through the board through hole 303 of the circuit board 30. Thereby, the circuit board 30 is positioned with respect to the board mounting portion 116 in the circumferential direction and the radial direction. And the claw part upper surface 1742 of the inner side board | substrate holding | maintenance part 17m contacts the lower edge part of the inner side flat surface 301 by moving the circuit board 30 below. Further, the claw portion upper surface 1742 of the outer substrate holding portion 17n is in contact with the lower edge portion of the outer flat surface 302. When the circuit board 30 is further moved downward, the claw part upper surface 1742 of the inner board holding part 17m is pushed by the inner flat face 301, and the second extension part 172 is elastically deformed to the first extension part 171 side. Further, the claw portion upper surface 1742 of the outer substrate holding portion 17n is pushed by the outer flat surface 302, and the second extension portion 172 is elastically deformed toward the first extension portion 171 side.

  When the lower surface of the circuit board 30 comes into contact with the upper surface of the substrate mounting portion 116, the claw portions 174 of the inner substrate holding portion 17 m and the outer substrate holding portion 17 n are positioned above the upper surface of the circuit substrate 30. As a result, the second extended portion 172 that has been elastically deformed returns to its original position, and the lower surface 1741 of the claw portion 174 contacts the upper surface of the circuit board 30. As a result, the circuit board 30 is restricted from moving upward by the inner substrate holding portion 17m and the outer substrate holding portion 17n.

  By attaching the circuit board 30 to the board attaching portion 116, movement of the circuit board 30 in the axial direction, the radial direction, and the circumferential direction is limited. In this state, the lead wire 146 (see FIG. 17 described later) is fixed to the connection portion 31 and the lead wire Wr is fixed to the external connection portion 32.

  The lead wire Wr connected to the external connection unit 32 is connected to an external device such as an external power source. When the lead wire Wr is slack, it is necessary to increase the distance between the lead wire Wr and the rotor 15 in order to prevent contact between the lead wire Wr and the rotor 15. However, when the distance between the lead wire Wr and the rotor 15 is increased, the motor 10 is increased in size. In order to reduce the size of the motor 10, it is preferable that the lead wire Wr be pulled out with some tension applied. In the present embodiment, the lead wire Wr is caught by the lead wire lead portion 1131 and drawn. Therefore, when pulling out the lead wire Wr, the circuit board 30 is pulled in the direction in which the lead wire Wr extends. In the present embodiment, the arrangement direction of the external connection portion 32, that is, the direction in which the lead wire Wr extends, intersects the direction in which the claw portion 174 of the inner substrate holding portion 17m extends and the direction in which the claw portion 174 of the outer substrate holding portion 17n extends. The direction to do. As described above, by providing the external connection portion 32, even when the circuit board 30 is pulled by the lead wire Wr, the deformation of the second extension portion 172 of the inner substrate holding portion 17m and the outer substrate holding portion 17n can be suppressed. Thereby, the circuit board 30 can be firmly held by the inner board holding part 17m and the outer board holding part 17n.

  In addition, although the board | substrate attachment part 116 is provided with the two inner side board | substrate holding | maintenance parts 17m and the one outer side board | substrate holding | maintenance part 17n, it is not limited to this. For example, three or more substrate holders 17 may be provided. Further, when the positioning accuracy by the boss 117 is high, the circuit board 30 is less likely to be rattled, so the number of the substrate holding portions 17 may be one. In this case, it may be arranged on the inner flat surface 301 side or may be arranged on the outer flat surface 302 side. A portion close to the side surface other than the inner flat surface 301 and the outer flat surface 302 of the circuit board 30 may be held. At this time, the side surface facing the substrate holding part 17 is preferably a flat surface.

<3.5 Configuration of Rotor 15>
The rotor 15 includes a rotor magnet 151 and a magnet holder 152. The rotor magnet 151 has a cylindrical shape, and N pole magnetic pole faces and S pole magnetic pole faces are alternately arranged in the circumferential direction. As the rotor magnet 151, for example, a cylindrical body integrally formed with a resin mixed with magnetic powder, and N poles and S poles are alternately magnetized in the circumferential direction can be used. . The rotor magnet 151 may be composed of a plurality of magnet pieces. In this case, in the magnet, the N pole and the S pole may be alternately arranged in the circumferential direction.

  The magnet holder 152 is made of a magnetic material, and the rotor magnet 151 is fixed to the inner surface. The magnet holder 152 includes a lid part 153 and a holder cylinder part 154. The lid portion 153 has an annular shape. The holder cylinder portion 154 extends downward from the radial outer edge of the lid portion 153. The magnet holder 152 is fixed inside the hub cylinder portion 223 of the impeller 20. As a result, the center of the rotor magnet 151 overlaps the central axis J.

<3.6 Configuration of Stator 14>
Next, details of the stator 14 will be described. FIG. 13 is a perspective view of the stator as viewed from below. FIG. 14 is a bottom view of the stator shown in FIG. As shown in FIG. 3 and the like, the stator 14 is fixed to the housing 112. As shown in FIGS. 13 and 14, the stator 14 includes a stator core 141, an insulator 142, and a coil 143. The stator core 141 is a laminate in which electromagnetic steel plates are laminated in the axial direction (vertical direction in FIG. 3). The stator core 141 is not limited to a laminated body in which electromagnetic steel plates are laminated, and may be a single member such as powder firing or casting.

  The stator core 141 has an annular core back 144 and a plurality of teeth 145. That is, the stator 14 includes an annular core back 144. It is fixed to the inner surface of the annular core back 144. The core back 144 and the housing 112 may be relatively fixed.

  The plurality of teeth 145 extend radially outward from the outer peripheral surface of the core back 144 toward the magnet (not shown) of the rotor 15 and are formed radially. That is, the teeth 145 extend radially outward from the core back 144. Thereby, the some teeth 145 are arrange | positioned in the circumferential direction. That is, the plurality of teeth 145 extend from the core back 144 in the radial direction and are arranged in the circumferential direction. The coil 143 is configured by winding a conducting wire around each tooth 145 via an insulator 142.

  The insulator 142 is made of, for example, resin or the like and covers at least the teeth 145. The insulator 142 insulates the stator core 141 including the teeth 145 from the coil 143. That is, the insulator 142 covers at least part of the upper surface, the lower surface, and the circumferential side surface of the tooth 145. The insulator 142 is not limited to resin, and a material that can insulate the stator core 141 and the coil 143 can be widely used.

  As described above, the coil 143 is formed by winding a conductive wire around the tooth 145 via the insulator 142. That is, the coil 143 is formed by winding a conductive wire around the tooth 145 via the insulator 142. The conducting wire constituting the coil 143 has a winding start portion and a winding end portion. A winding start portion and a winding end portion of the conducting wire are lead wires 146 drawn from the coil 143. The lead line 146 is connected to the connection portion 31 of the circuit board 30. That is, the lead wire 146 is drawn from the coil 143 and is electrically connected to the circuit board 30. The conducting wire is wound over several coils 143. Therefore, the stator 14 includes two lead wires 146. In the present embodiment, since the motor 10 is a single-phase motor, two lead wires 146 are provided, but the present invention is not limited to this. For example, when the motor 10 is a three-phase motor, three lead wires 146 may be provided.

  The connection unit 31 is connected to a drive circuit (not shown) mounted on the circuit board 30, and current is supplied from the drive circuit to the coil 143 through the lead wire 146. The motor 10 is a brushless motor. By supplying current to the plurality of coils 143 at a predetermined timing, the coils 143 and the rotor magnet 151 are attracted or repelled, whereby the rotor 15 is rotated. The stator 14 includes a guide portion 18 that guides a lead wire 146 drawn from the coil 143.

<3.7 Configuration of Guide 18>
Next, the detail of the guide part 18 is demonstrated with reference to drawings. FIG. 15 is a perspective view of the enlarged guide portion as viewed from above. FIG. 16 is a perspective view of the enlarged guide portion as viewed from below. FIG. 17 is an enlarged cross-sectional view in which the stator including the guide portion and the base portion are enlarged.

  As shown in FIGS. 15, 16, and 17, the guide portion 18 is disposed below the insulator 142. The guide portion 18 is disposed radially outward from the coil 143. That is, the guide portion 18 is provided at a lower portion of the insulator 142 and radially outward than the coil 143. The guide unit 18 is configured by the same member as the insulator 142. The guide part 18 includes a first wall part 181, a second wall part 182, and a bent part 183. The first wall portion 181 extends downward from the lower surface of the insulator. The first wall portion 181 extends along the circumferential direction. Both ends in the circumferential direction of the first wall portion 181 are provided with curved surfaces 184. The radially outer surface 1811 of the first wall portion 181 is smoothly connected to the radially inner surface 1812. In other words, the curved surface 184 is a curved surface that is differentiably connected. Further, the curved surface 184 itself is a differentiable curved surface. That is, the first wall portion 181 is connected to the radially outer surface 1811 and the radially inner surface 1812 via the curved surface 184 at both circumferential ends.

The bent portion 183 is connected to the lower end portion of the first wall portion 181 and extends radially outward. That is, the bent portion 183 extends radially outward from the lower end portion of the first wall portion 181. Here, the bent portion 183 is orthogonal to the central axis J. The bent portion 183 faces the base portion 11 and the circuit board 30 in the axial direction with a gap therebetween. The second wall portion 182 is connected to the radially outer edge of the bent portion 183 and extends upward in the axial direction. The first wall portion 181 and the second wall portion 182 are opposed to each other in the radial direction with the gap 185 interposed therebetween. That is, a second wall portion 182 is provided that extends upward from the radial outer edge of the bent portion 183 and faces the first wall portion 181 with a gap. The radial thickness of the first wall portion 181 is larger than the radial thickness of the second wall portion 182. A force may be applied to the first wall portion 181 when the lead wire 146 is wound. By comprising in this way, the intensity | strength of the 1st wall part 181 can be improved.

  The lead wire 146 is in contact with the radial outer surface 1811 and the radial inner surface 1812 of the first wall portion 181. That is, at least a part of the lead wire 146 is disposed in the circumferential direction along the radially outer surface of the first wall portion 181. The lead wire 146 is in contact with both the radially inner surface 1812 and the radially outer surface 1811 of the first wall portion 181. Further, at least a part of the lead wire 146 is disposed between the first wall portion 181 and the second wall portion 182. In the present embodiment, the lead wire 146 is wound around the first wall portion 181 of the guide portion 18 one or more times. At this time, the lead wire 146 contacts the curved surface 184. Thereby, when the lead wire 146 crosses between the radial direction outer surface 1811 and the radial direction inner surface 1812, it is hard to concentrate stress and the load of the lead wire 146 can be reduced. The leading end of the lead wire 146 wound around the first wall portion 181 is fixed to the connection portion 31 provided on the circuit board 30. Note that fixing of the lead wire 146 to the connection portion 31 can be performed by soldering.

  The lead wire 146 drawn out from the coil 143 is once wound around the guide portion 18 and connected to the connection portion 31. When the motor 10 is assembled, the stator 14 assembled in advance is fixed to the housing 112. The coil 143 is formed by winding a conductive wire around the teeth 145 in the stator 14 before being fixed to the housing 112. At this time, the lead wire 146 and the coil 143 are not easily loosened because the lead wire 146 is wound around the guide portion 18. Thereby, the operation | work at the time of manufacture of the motor 10 becomes easy. Further, by winding the lead wire 146 around the guide portion 18, it is possible to receive the force acting on the lead wire 146 at the guide portion 18. Thereby, it can suppress that the lead wire 146 moves at the time of fixation with the connection part 31. FIG.

  When the lead wire 146 and the connection portion 31 are fixed, the lead wire 146 may be pulled in the direction in which the connection portion 31 is arranged. That is, a downward force may act on the lead wire 146. The bent portion 183 is connected to the lower end portion of the first wall portion 181 and extends radially outward. Therefore, even if a downward force is applied, the lead wire 146 contacts the upper surface of the bent portion 183. That is, it is possible to suppress the movement of the lead wire 146 when the connection portion 31 is fixed.

  The guide portion 18 is disposed at a position where a part thereof faces the rotor magnet 151 in the axial direction. That is, at least a part of the guide portion 18 faces the rotor magnet 151 in the axial direction. The lead wire 146 guided by the guide portion 18 is disposed below the rotor 15 and separated from the rotor 15. Therefore, contact between the lead wire 146 and the rotor 15 can be suppressed.

  Further, the connecting portion 31 is located on the radially outer side of the radially outer edge of the bent portion 183. That is, the connecting portion 31 is located on the radially outer side with respect to the radially outer edge of the bent portion 183. Furthermore, the connecting portion 31 is located radially outward from the magnet holder 152 of the rotor 15. That is, the connecting portion 31 is located on the outer side in the radial direction than the magnet holder 152. By arranging in this way, the lead wire 146 and the connecting portion 31 can be fixed in a state where the shaft 12 fixed to the rotor 15 is attached to the base portion 11, and the working efficiency can be improved. For example, even when the shaft 12, the rotor 15, and the impeller 20 are fixed by insert molding, the distance between the connection portion 31 and the insulator 142 can be increased. Therefore, a jig or the like for fixing the lead wire 146 and the connection portion 31 can be easily arranged, and work efficiency can be improved.

  The insulator 142 includes two guide portions 18, but is not limited to this. For example, when a plurality of lead wires 146 can be wound, the number of guide portions 18 may be one. For example, when there are a plurality of lead lines 146, the number of guide portions 18 may be the same as the number of lead lines 146. That is, the number of guide portions 18 is the same as the number of lead lines 146.

<Modification of 3.7.1 Guide>
FIG. 18 is an enlarged cross-sectional view in which a stator and a base portion including another example of the guide portion are enlarged. As shown in FIG. 18, the guide portion 18 a includes a first wall portion 181 and a bent portion 183. That is, the guide part 18a is the structure which excluded the 2nd wall part 182 with respect to the guide part 18, and is the same as the guide part 18 about a part other than this. Therefore, the same parts as those of the guide part 18 of the guide part 18a are denoted by the same reference numerals and detailed description of the same parts is omitted.

  For example, when the lead wire 146 is wound around the first wall portion 181 a plurality of times and the lead wire 146 is difficult to shift, the looseness of the lead wire 146 can be suppressed even if the second wall portion 182 is omitted. Even if a downward force is applied to the lead wire 146, the lead wire 146 contacts the upper surface of the bent portion 183. That is, it is possible to suppress the movement of the lead wire 146 when the connection portion 31 is fixed.

  Next, a method for assembling the blower A will be described. In the blower A, the flange portion 167 of the chip holder 161 is fixed to the housing 112 by insert molding. The chip holder 161 opens upward, that is, toward the holding recess 115 of the housing 112. The suction magnet 162 is inserted into the chip holder 161. At this time, the lower surface 1622 of the attracting magnet 162 is in contact with the second surface 1652 of the bottom 165 of the chip holder 161.

  The lower surface 1622 and the second surface 1652 are fixed by magnetic force. At this time, a magnetic force also acts between the cylindrical portion 166 and the side surface of the attracting magnet 162. Thereby, a part of the attraction magnet 162 comes into contact with the inside of the cylindrical portion 166. The upper surface 1621 of the attracting magnet 162 is positioned below the flange portion 167. That is, the attracting magnet 162 is accommodated in the cylindrical portion 166. Thereby, the cylinder part 166 works as a back yoke of the attraction magnet 162 and can strengthen the magnetic force of the attraction magnet 162. Then, a thrust plate 163 is disposed on the upper surface of the suction magnet 162. The thrust plate 163 is housed inside the cylindrical portion 166.

  Then, after the retaining ring 19 is inserted into the holding recess 115, the bearing 13 is press-fitted into the retaining recess 115 from above the retaining ring 19. Accordingly, the retaining ring 19 is fixed by being sandwiched between the lower end portion of the bearing 13 and the bottom surface of the bearing holding portion 1151.

  The circuit board 30 is attached to the board attaching part 116 of the base part 11. At this time, the circuit board 30 is fixed to the base portion 11 by holding the vicinity of the inner flat surface 301 and the outer flat surface 302 by the substrate holding portion 17 while passing the boss 117 through the substrate through hole 303 of the circuit substrate 30. . A lead wire Wr connected to an external power source is connected to the external connection portion 32 of the circuit board 30 fixed to the base portion 11. Then, the lead wire Wr is hooked on the lead wire lead portion 1131 of the arm portion 113.

  Then, an insulator 142 is attached to the stator core 141, and a coil 143 is formed by winding a conductive wire around the tooth 145 via the insulator 142. At this time, the lead wire 146 drawn out from the coil 143 is wound around the guide portion 18. At this time, the leading end of the lead wire 146 is drawn out radially outside the radial outer edge of the stator 14.

  Then, the core back 144 of the stator 14 is disposed outside the housing 112, and the stator 14 is attached to the base portion 11. At this time, the stator 14 is fixed to the housing 112. Then, the end portion of the lead wire 146 drawn out from the coil 143 is fixed to the connection portion 31 of the circuit board 30 by soldering. By arranging the connecting portion 31 on the radially outer side of the stator 14, the lead wire 146 can be easily fixed to the connecting portion 31.

  The upper end portion of the shaft 12 is fixed to the boss portion 224 of the impeller 20. Then, the rotor 15 including the rotor magnet 151 and the magnet holder 152 is attached to the hub tube portion 223. Then, the shaft 12 is inserted into the holding recess 115 from above. At this time, the shaft 12 passes through the bearing 13. Then, the lower surface convex portion 122 of the shaft 12 is pressed against the through hole of the retaining ring 19 and pushed. The through-hole of the retaining ring 19 is smaller than the outer diameter of the shaft 12 but has a size that allows the lower end of the shaft 12 to pass through when elastically deformed. Then, the retaining ring 19 is moved to a position overlapping the retaining groove 121 of the shaft 12 in the radial direction. At this time, the lower surface convex part 122 contacts the thrust plate 163. When the shaft 12 is attached to the bearing 13, the radially outer surface of the stator 14 faces the inner surface of the rotor magnet 151 in the radial direction.

  In the air blower A assembled in this way, the shaft 12 is attached to the holding recess 115 of the housing 112 via the bearing 13 so that the radial outer edge of the stator 14 and the rotor magnet 151 are spaced apart in the radial direction. opposite. A magnetic force is generated between the coil 143 and the rotor magnet 151 by causing a current to flow through the coil 143 through the lead wire 146. A rotational force acts on the rotor 15 by the magnetic attractive force and repulsive force. As a result, the motor 10, that is, the shaft 12 rotates around the central axis J. And the impeller 20 fixed to the shaft 12 rotates, and airflow is generated.

  Although the embodiments of the present invention have been described above, the embodiments can be variously modified and combined within the scope of the gist of the present invention.

  According to this invention, it can utilize as a motor which rotates the impeller of an air blower.

A ... Blower, 10 ... Motor, 11 ... Base part, 111 ... Plate part, 112 ... Housing, 1121 ... Notch surface, 113 ... Arm part, 1131 ... Lead wire lead-out part, 114 ... vibration-proof member, 115 ... holding recess, 1151 ... bearing holding part, 1152 ... small diameter part, 116 ... substrate mounting part, 117 ... boss, 118 ... Base through hole, 12 ... Shaft, 121 ... Groove, 122 ... Lower surface convex part, 13 ... Bearing, 14 ... Stator, 141 ... Stator core, 142 ... Insulator, 143 ... Coil, 144 ... Core back, 145 ... Teeth, 146 ... Lead wire, 15 ... Rotor, 151 ... Rotor magnet, 152 ... Magnet holder, 153 ..Cover part 54... Holder cylinder part, 16... Magnetic attraction part, 161... Chip holder, 161 a... Chip holder, 161 b... Chip holder, 161 c. , 1621 ... upper surface, 1622 ... lower surface, 163 ... thrust plate, 165 ... bottom, 1651 ... first surface, 1652 ... second surface, 166 ... cylindrical portion, 166c ... Cylinder part, 167 ... Flange part, 167a ... Flange part, 167b ... Flange part, 1671 ... Flange convex part, 17 ... Substrate holding part, 17m ... Inner board holding 17n: outer substrate holding part, 171 ... first extension part, 172 ... second extension part, 173 ... coupling part, 174 ... claw part, 1741 ... lower surface of the claw part , 1742... Nail upper surface, 1 ... guide part, 18a ... guide part, 181 ... first wall part, 1811 ... radial outer surface, 1812 ... radial inner surface, 182 ... second wall part, 183 ...・ Bending part, 184 ... curved surface, 185 ... gap, 19 ... retaining ring, 20 ... impeller, 21 ... impeller base, 22 ... impeller hub, 220 ... lower surface Recessed portion, 221... Hub top plate portion, 222... Hub inclined portion, 223... Hub cylindrical portion, 224... Boss portion, 225. Support frame, 30 ... circuit board, 301 ... inner flat surface, 302 ... outer flat surface, 303 ... substrate through hole, 31 ... connecting portion, 32 ... external connecting portion, 33 ... Detection unit

Claims (10)

A shaft extending along a central axis extending vertically;
A rotor rotatable around a central axis;
A stator radially opposed to the rotor;
A circuit board disposed below the stator,
The stator is
An annular core back,
A plurality of teeth extending in a radial direction from the core back and arranged in a circumferential direction;
An insulator that covers at least a part of the upper surface, the lower surface, and the circumferential side surface of the tooth;
A coil formed by winding a conductive wire around the teeth via the insulator;
A lead wire drawn from the coil and electrically connected to the circuit board,
The insulator lower portion includes a guide portion radially outward from the coil,
The guide part is
A first wall extending downward from the bottom surface of the insulator;
A bent portion extending radially outward from a lower end portion of the first wall portion,
At least a part of the lead wire is a motor arranged in a circumferential direction along a radially outer surface of the first wall portion. The first wall extends in the circumferential direction,
The motor according to claim 1, wherein the lead wire is in contact with both a radially inner surface and a radially outer surface of the first wall portion.   The motor according to claim 2, wherein the first wall portion has a radially outer surface and a radially inner surface connected via a curved surface at both circumferential ends. The insulator is
A second wall portion extending upward from a radially outer edge of the bent portion and facing the first wall portion via a gap;
The motor according to claim 1, wherein at least a part of the lead wire is disposed between the first wall portion and the second wall portion.   The motor according to any one of claims 1 to 4, wherein a radial thickness of the first wall portion is larger than a radial thickness of the second wall portion. The circuit board includes a connection portion to which the lead wire is connected,
The motor according to any one of claims 1 to 5, wherein the connecting portion is located on a radially outer side than a radially outer edge of the bent portion. The rotor includes a magnet holder that holds a rotor magnet that is radially opposed to the stator,
The motor according to claim 6, wherein the connection portion is located radially outside the magnet holder.   The motor according to claim 6 or 7, wherein at least a part of the guide portion faces the rotor magnet in the axial direction.   The motor according to any one of claims 1 to 8, wherein the number of the guide portions is the same as the number of the lead wires. A motor according to any one of claims 1 to 9,
An air blower comprising: an impeller fixed to the shaft.

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